Abstract
The brown garden snail, Helix aspersa, attacks several important food crops in Egypt. The effects of the insect-growth inhibitors chlorfluazuron and flufenoxuron on H. aspersa were investigated. Snails were fed lettuce treated with 0.5, 1, 2, 3, and 5% of either of the two componds, and chlorfluazuron was found to be more toxic than flufenoxuron. Minor effects of both compounds were noted on protein and lipid reserves. Chlorfluazuron increased the glycogen content, and flufenoxuron decreased it. Chlorfluazuron also increased the activities of glutamic-oxaloacetic transaminase and glutamic-pyruvic transaminase and depressed the activities of alkaline phosphatase and acid phosphatase throughout the study period.